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Old 11-14-2012, 12:10 PM   #3
jgold47
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Join Date: Sep 2010
Location: Imported from Detroit
Posts: 1,261
My Ride: 2004 X5 3.0
These are pretty long life button batteries. I would think you would be able to get several months of standby if not more. I think people go yeas without using their extra key and I they work fine.
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